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This Aluminum Pipe From The Round Gas Vent Series Is A Type B Gas Component and Consists Of The Duralock System For A Tight Seal. Use For Venting Listed Natural Gas or Liquid Propane Category I, Draft Hood Appliances, or Appliances That Have Been Specifically Tested and Listed To Use Type B Gas Vent. The Appliances Listed Typically Use Type B Gas Vent Systems, But Not Always: Furnaces, Water Heaters, Boilers, Room Heaters, Decorative Gas Appliances, and Unit Heaters. To Calculate Installed Length, Subtract 1 1/2 From Each Connection Of Vent. A 1 Clearance (Air Space) To Combustible Materials Must Be Maintained. To Calculate Od Add 5/8.